This Part Fits the following kits / parts:

#67773 - HBプロモールドインナーフォーム(レッド/1/8バギー/2pcs）

1/8 スケール バギータイヤ用

HB's breakthrough inner foam is finally a reality and it's ready to
hit the dirt. Get the most out of your HB tires or any other 1/8
buggy tire with our perfectly fitting and ultimate density red
foam. This foam works great in all conditions and is available now!
Don't settle for anything less than first place, get HB inner foams
today!

These are the same inner foams used in the professionally assembled
HB mounted 1/8 scale buggy tyres.